Chapter 3 Project Description
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Ref: ERI/2/02-13/EIA February 2014 Proposed Upgrading of Bayan Baru Regional Plant (PEG061), Pulau Pinang CHAPTER 3 PROJECT DESCRIPTION 3.1 INTRODUCTION The BB-STP shall treat domestic wastewater generated from the sewerage sub-catchments covers more than half of Mukim 12 area and part of Mukim 13, which include the area of Bayan Baru, Sungai Ara, Bukit Jambul, Sungai Dua, Sungai Nibong, Batu Uban and Bayan Lepas Free Trade Zone. The proposed BB-STP Phase 2 will use the Hybrid Combination Process of Activated Sludge & Moving Bed Biofilm Reactor (AS+MBBR) system, and designed to serve an ultimate population equivalent (PE) of 450,000 PE. The overall BB-STP will therefore have an ultimate design capacity of 650,000 PE at the target year of 2035. The BB-STP will incorporate sludge treatment facilities (STF) for all in-plant sludge. 3.2 LOCATION AND SURROUNDINGS The proposed BB-STP is geo-referenced at approximate latitude of 5o 18’ 53.69” N and longitude 100o 17’ 40.27” E, and shown in the satellite image in Figure 3.2A. The total area of the Bayan Baru regional plant is 29.21 acres. The area available for Phase 2 development is about 16.8 acres, as shown in the General Layout of Bayan Baru Sewerage Sub-Catchments in Figure 2.2A. The proposed BB-STP Phase 2 site is located in within the existing Bayan Baru Regional Treatment Plant (Asset No. PEG061). The proposed site is bounded by industrial entities in the north, west and east. The site is bordered at the south by Kluang River, where it discharges into the South Channel. The river downstream flows from north-west to south - east along the southern border of the proposed STP. The buffer zone between the STP boundary and the nearest occupied development may comprise road reserve, drainage reserve, open space or other uninhabited land use. The minimum buffer distance required between the boundary of the STP and the nearest occupied buildings are as follows: 30m surround, for residential or commercial development 20m surround, for industrial development 10m surround, for fully enclosed STP. (Source: Malaysian Sewerage Industry Guidelines, Volume IV: Sewage Treatment Plants, SPAN, 2010). Client: Suruhanjaya Perkhidmatan Air Negara 3-1 Ref: ERI/2/02-13/EIA February 2014 Proposed Upgrading of Bayan Baru Regional Plant (PEG061), Pulau Pinang In the proposed STP site, a minimum 20m buffer zone is provided between the STP buildings and the adjacent industrial lots. The minimum buffer requirements are met by the proposed STP. The available buffer distances to the nearest industrial zone are provided in Table 3.2a and shown in Figure 3.2B. Table 3.2a: Available Buffer Distances from Bayan Baru STP Direction Receptor Buffer Distance Land use within Buffer Zone North Industries within Bayan 20 m Mixed horticulture Lepas Industrial Area Scrub East Industries, Infrastructure 70 m Mixed horticulture North-East & Utilities – Bayan Baru Scrub Electrical Grid South Industries 700 m Road reserve South-East Health Care Centre –St Industrial Zone Jude Medical Drainage Reserve West Industries within Bayan 20 m Mixed horticulture Lepas Industrial Area Scrub West Residential, Tourism & 950 m Road reserve Shrines – Halaman Industrial Zone Mayang Pasir, Snake Drainage Reserve Temple, Than Hsing Temple, a church. North West Residential and 900 m Road reserve commercial – Industrial Zone Pangsapuri Jalan Drainage Reserve Tengah, Taman Sunway Tunas, From the table, it is noted that there are no residential or institutional (e.g. hospital, school) receptors close to the project site boundary. The nearest residential receptor is located at least 500 meters away from the project. However, the project site border is recommended to be landscaped with suitable shrubs and trees. Furthermore, the process units, which have high noise levels, should be fully enclosed and acoustically treated to minimise noise impacts. Client: Suruhanjaya Perkhidmatan Air Negara 3-2 Ref: ERI/2/02-13/EIA February 2014 Proposed Upgrading of Bayan Baru Regional Plant (PEG061), Pulau Pinang 3.3 PROPOSED BB-STP PHASE 2 3.3.1 Population Equivalent and Design Sewage Flow The total land available for the upgrading project is about 16.8 acres. The proposed sewage treatment plant will have a treatment capacity of 450 000 PE (101.25 MLD). The existing Phase 1 STP has a treatment capacity of 200,000 PE (45 MLD). In this report, PE projection is analysed using two different projection studies, namely;- a) Sewage Catchment Study for West and South Pulau Pinang, by Messrs. ERINCO, 2009 b) Proposed Extension and Upgrading of Bayan Baru Sewer Network and Other Assocated Works, by Messrs. Sepakat Setia Perunding (SSP) Sdn Bhd. (July 2013) The total projected PE based on 2 difference studies of the Bayan Baru STP from year 2015 to year 2035 is shown in Table 3.3.1a. Table 3.3.1a: Design Population Equivalent (PE) Description 2015 2020 2025 2030 2035 SSP Network Consultant, 469,912 520,943 569,818 609,719 650,728 2013(2) Sewage Catchment 466,628 495,874 519,320 539,766 554,489 Study, 2009(1) Percentage difference between the 2013 and 0.7% 5.1% 9.7% 12.9% 17.4% 2009 PE Projections Source: 1) Sewage Catchment Study for West and South Pulau Pinang, ERINCO, 2009 2) Proposed Extension and Upgrading of Bayan Baru Sewer Network and Other Associated Works, Pulau Pinang. Sepakat Setia Perunding Sdn. Bhd. 2013 The later PE projection by the Network Consultant (SSP) for the ultimate population equivalent of the Bayan Baru Catchment is 650 000 PE at year 2035. Based on the latest information gathered from IWK, the Network Consultant reviewed the development in the Bayan Baru Sewerage Catchment. Applying the PE projection methods of population census, land use and development submissions, the PE projection for the Bayan Baru Sewerage Catchment was revised as shown in Table 3.3.1a above. The latest PE projection by the Network Consultant is found to be between 0.5% and 17.4% higher than the projection by the Sewage Catchment Study 2009. (Table 3.3.1a) The SSP projections are based on the latest available information and the slight difference between these 2 projections are justifiable. Hence, the sizing of the Bayan Baru STP to serve 650,000 PE (ultimate at year 2035) is justified. Client: Suruhanjaya Perkhidmatan Air Negara 3-3 Ref: ERI/2/02-13/EIA February 2014 Proposed Upgrading of Bayan Baru Regional Plant (PEG061), Pulau Pinang 3.3.2 Design Influent Quality The influent quality is calculated by per capita pollution load and STP inflow. Table 3.3.2a shows the design sewage quality of influent and effluent. Table 3.3.2a: Design Influent Value Influent Quality Value Pollution Sewage Parameter Influent Quality (g/capita/day) load inflow (mg/l) (kg/day) (m3/day) BOD 56 36,400 146,250 248.9 ≒ 250 SS 68 44,200 146,250 302.2 ≒ 300 COD 113 73,450 146,250 502.2 ≒ 500 TN* 11 7,150 146,250 48.9 ≒ 50 AMN 7 4,550 146,250 31.1 ≒ 30 O&G 11 7,150 146,250 48.9 ≒ 50 Source: Malaysian Sewerage Industry Guidelines, Volume 4 3.3.3 Treatment Level and Target Quality of Sewage Effluent Consistent with the discharge limits specified under the Environmental Quality (Sewage) Regulations, 2009; the acceptable limits of residue contaminants in the treated effluent for discharge into a river shall not be more than the limits shown in Table 3.3.3a. Table 3.3.3a: Environmental Quality (Sewage) Regulations, 2009 – 2nd Schedule SECOND SCHEDULE (Regulation 7) ACCEPTABLE CONDITION OF SEWAGE DISCHARGE OF STANDARDS A & B (I) New sewage treatment system Parameter Unit Standard A B (1) (2) (3) (4) (a) Temperature Oc 40 40 (b) pH value - 6.0-9.0 5.5-9.0 (c) BOD5 at 20°c mg/L 20 50 (d) COD mg/L 120 200 (e) Suspended Solids mg/L 50 100 (f) Oil and Grease mg/L 5.0 10.0 (g) Ammoniacal Nitrogen (enclosed waterbody) mg/L 5.0 5.0 (h) Ammoniacal Nitrogen (river) mg/L 10.0 20.0 (I) Nitrate - Nitrogen (river) mg/L 20.0 50.0 (j) Nitrate - Nitrogen (enclosed water body) mg/L 10.0 10.0 (k) Phosphorous (enclosed water body) mg/L 5.0 10.0 Note: Standard A is applicable to discharges into any inland waters within catchment areas listed in the Third Schedule, while Standard B is applicable to any other inland or Malaysian coastal waters. Client: Suruhanjaya Perkhidmatan Air Negara 3-4 Ref: ERI/2/02-13/EIA February 2014 Proposed Upgrading of Bayan Baru Regional Plant (PEG061), Pulau Pinang The discharge point is located upstream of the water intake point and the STP is required to comply with Standard B effluent limits. However, the STP will be designed to operate to Category 1 - Standard A effluent limits, as is the common practice for all new regional STPs. In order to allow for transient reductions in treatment efficiency due to periodic plant maintenance and unforeseen high impulse of hydraulic and organic loadings on the sewage treatment process units, the STP is designed to produce final effluents with BOD, SS, COD O&G and AN values less than or equal to the design effluent values (Table 3.3.3b). Thus, the Design Standard A is more stringent than the Absolute Standard A. This is to ensure consistent compliance with the required effluent standard. Table 3.3.3b: Design Effluent Values (for treated discharge from STP) Discharge to River Parameter Standard A Absolute Design 1 Biochemical Oxygen Demand (BOD5) 20 10 2 Suspended Solids (SS) 50 20 3 Chemical Oxygen Demand (COD) 120 60 4 Ammoniacal Nitrogen (AN) 10 5 5 Nitrate Nitrogen (NO3-N) 20 10 6 Oil and Grease (O&G) 5 2 Source: Malaysian Sewerage Industry Guidelines, Volume 4 Note: All values in mg/L unless otherwise stated * Note: Design influent value is for TN but effluent standard is for Nitrate Nitrogen (NO3-N).